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Localization of virtual sound sources with bilateral hearing aids in realistic acoustical scenes
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10.1121/1.4705292
/content/asa/journal/jasa/131/6/10.1121/1.4705292
http://aip.metastore.ingenta.com/content/asa/journal/jasa/131/6/10.1121/1.4705292

Figures

Image of FIG. 1.
FIG. 1.

Spectrograms of the target signals used in the localization experiment. Four scenes were implemented: a cafeteria, an office, a street and a forest. The listeners had to localize (top left) a male speaker, (top right) a phone, (bottom left) an ambulance siren, and (bottom right) a bird, respectively.

Image of FIG. 2.
FIG. 2.

Mean angular rms error, , for the different scenes for the three sound reproduction methods. ls_open denotes loudspeaker playback with open ear canal (the natural listening condition), ls_cic stands for loudspeaker playback with the open CICs in the ears and sim represents the fully simulated environments with sound playback through the open CICs.

Image of FIG. 3.
FIG. 3.

Mean rms error (above) and percentage of front/back confusions (below) for each reproduction methods for the different scenes. The error bars show 1 standard deviation. Chance level, along with 95% confidence interval is plotted in dashed.

Image of FIG. 4.
FIG. 4.

Mean rms error for positions played at front (, above) and in the back (, below).

Image of FIG. 5.
FIG. 5.

Mean rms error (above) and percentage of front/back confusions (below) for the sim (reference, taken from Fig. 3), omni, NC and beam algorithms for the different scenes. The error bars show one standard deviation. Chance level along with 95% confidence interval lays between the two dashed line.

Image of FIG. 6.
FIG. 6.

Mean rms error for positions played at front (, above) and in the back (, below).

Image of FIG. 7.
FIG. 7.

Percentage of front-back confusions for positions played at front (, above) and in the back (, below). Note that the y-axis has been rescaled.

Image of FIG. 8.
FIG. 8.

Directivity characteristics of HRTFs measured at the ear canal with the open CIC microphones (black), behind the ear with the BTE microphones (gray) and of the beamformer (light gray) implemented at three different frequency bands. The directivities of the transfer functions measured at the left ear are plotted as a solid line. For the right ear, they are drawn in dashed lines.

Tables

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TABLE I.

Octave band reverberation times of the measured and the simulated rooms in [ms].

Generic image for table
TABLE II.

Mean results and standard deviations for all the scenes tested. The last column shows performance averaged across scenes. f-b denotes front-back confusions in percent.

Generic image for table
TABLE III.

Mean results and standard deviations for the BTE conditions. The last column shows performance averaged across scenes.

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/content/asa/journal/jasa/131/6/10.1121/1.4705292
2012-06-14
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Localization of virtual sound sources with bilateral hearing aids in realistic acoustical scenes
http://aip.metastore.ingenta.com/content/asa/journal/jasa/131/6/10.1121/1.4705292
10.1121/1.4705292
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